Depends on what is going on around you when it happens, how long it takes you to realize that something is wrong, and what to do about it. It wouldn't surprise

Depends on what is going on around you when it happens, how long it takes you to realize that something is wrong, and what to do about it. It wouldn't surprise me if many people would not even realize that they have power assist in the first place, and just assume that the wheel somehow got stuck and there is nothing they can do. Although I would imagine that the most common failure case is the wheel slowly getting harder to turn over a period of days or weeks.